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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>2.8.2. Metadata, Machine Configuration, and Policy Configuration</title> | ||
| 5 | <link rel="stylesheet" type="text/css" href="../book.css"> | ||
| 6 | <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> | ||
| 7 | <link rel="home" href="index.html" title="Getting Started With Yocto Project"> | ||
| 8 | <link rel="up" href="development-concepts.html" title="2.8. Development Concepts"> | ||
| 9 | <link rel="prev" href="user-configuration.html" title="2.8.1. User Configuration"> | ||
| 10 | <link rel="next" href="distro-layer.html" title="2.8.2.1. Distro Layer"> | ||
| 11 | </head> | ||
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="2.8.2. Metadata, Machine Configuration, and Policy Configuration"> | ||
| 13 | <div class="titlepage"><div><div><h3 class="title"> | ||
| 14 | <a name="metadata-machine-configuration-and-policy-configuration"></a>2.8.2. Metadata, Machine Configuration, and Policy Configuration</h3></div></div></div> | ||
| 15 | <p> | ||
| 16 | The previous section described the user configurations that | ||
| 17 | define BitBake's global behavior. | ||
| 18 | This section takes a closer look at the layers the build system | ||
| 19 | uses to further control the build. | ||
| 20 | These layers provide Metadata for the software, machine, and | ||
| 21 | policy. | ||
| 22 | </p> | ||
| 23 | <p> | ||
| 24 | In general, three types of layer input exist: | ||
| 25 | </p> | ||
| 26 | <div class="itemizedlist"><ul class="itemizedlist" type="disc"> | ||
| 27 | <li class="listitem"><p><span class="emphasis"><em>Policy Configuration:</em></span> | ||
| 28 | Distribution Layers provide top-level or general | ||
| 29 | policies for the image or SDK being built. | ||
| 30 | For example, this layer would dictate whether BitBake | ||
| 31 | produces RPM or IPK packages.</p></li> | ||
| 32 | <li class="listitem"><p><span class="emphasis"><em>Machine Configuration:</em></span> | ||
| 33 | Board Support Package (BSP) layers provide machine | ||
| 34 | configurations. | ||
| 35 | This type of information is specific to a particular | ||
| 36 | target architecture.</p></li> | ||
| 37 | <li class="listitem"><p><span class="emphasis"><em>Metadata:</em></span> | ||
| 38 | Software layers contain user-supplied recipe files, | ||
| 39 | patches, and append files. | ||
| 40 | </p></li> | ||
| 41 | </ul></div> | ||
| 42 | <p> | ||
| 43 | </p> | ||
| 44 | <p> | ||
| 45 | The following figure shows an expanded representation of the | ||
| 46 | Metadata, Machine Configuration, and Policy Configuration input | ||
| 47 | (layers) boxes of the | ||
| 48 | <a class="link" href="development-concepts.html#general-yocto-environment-figure">general Yocto Project Development Environment figure</a>: | ||
| 49 | </p> | ||
| 50 | <p> | ||
| 51 | </p> | ||
| 52 | <table border="0" summary="manufactured viewport for HTML img" cellspacing="0" cellpadding="0" width="720"><tr style="height: 675px"><td align="center"><img src="figures/layer-input.png" align="middle" width="720"></td></tr></table> | ||
| 53 | <p> | ||
| 54 | </p> | ||
| 55 | <p> | ||
| 56 | In general, all layers have a similar structure. | ||
| 57 | They all contain a licensing file | ||
| 58 | (e.g. <code class="filename">COPYING</code>) if the layer is to be | ||
| 59 | distributed, a <code class="filename">README</code> file as good practice | ||
| 60 | and especially if the layer is to be distributed, a | ||
| 61 | configuration directory, and recipe directories. | ||
| 62 | </p> | ||
| 63 | <p> | ||
| 64 | The Yocto Project has many layers that can be used. | ||
| 65 | You can see a web-interface listing of them on the | ||
| 66 | <a class="ulink" href="http://git.yoctoproject.org/" target="_self">Source Repositories</a> | ||
| 67 | page. | ||
| 68 | The layers are shown at the bottom categorized under | ||
| 69 | "Yocto Metadata Layers." | ||
| 70 | These layers are fundamentally a subset of the | ||
| 71 | <a class="ulink" href="http://layers.openembedded.org/layerindex/layers/" target="_self">OpenEmbedded Metadata Index</a>, | ||
| 72 | which lists all layers provided by the OpenEmbedded community. | ||
| 73 | </p> | ||
| 74 | <div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"> | ||
| 75 | <h3 class="title">Note</h3> | ||
| 76 | Layers exist in the Yocto Project Source Repositories that | ||
| 77 | cannot be found in the OpenEmbedded Metadata Index. | ||
| 78 | These layers are either deprecated or experimental in nature. | ||
| 79 | </div> | ||
| 80 | <p> | ||
| 81 | </p> | ||
| 82 | <p> | ||
| 83 | BitBake uses the <code class="filename">conf/bblayers.conf</code> file, | ||
| 84 | which is part of the user configuration, to find what layers it | ||
| 85 | should be using as part of the build. | ||
| 86 | </p> | ||
| 87 | <p> | ||
| 88 | For more information on layers, see the | ||
| 89 | "<a class="link" href="../dev-manual/understanding-and-creating-layers.html" target="_self">Understanding and Creating Layers</a>" | ||
| 90 | section in the Yocto Project Development Tasks Manual. | ||
| 91 | </p> | ||
| 92 | </div></body> | ||
| 93 | </html> | ||